Can concussions kill you?

No, they don't kill you but They may affect you later in life. Sometimes they can cause memory loss or mental problems. Many football players get concussions but they normally don't die from it. Mental illnesses caused by concussions may kill you/ cause you to kill yourself but, the actual concussion won't.

Your answer is  d.)relationship between pressure and air volume and led to the understanding of how respiration works